Hi Christoph,

I tried increasing the box length in z direction, but the error still
persists. Its two layers of graphene each have 96 atoms.

The errors is:

"I have 192 beads in 2 molecules
I have 48 beads in 2 molecules for the coarse graining
Reading frame       0 time    0.000




*1.1281.5872.668 0.3381.1411.688*
an error occurred:
coarse-grained bead is bigger than half the box
 (atoms C (id 1), C (id 21) , molecule 1)"


Is there an issue with the atomistic simulation?


On Sat, Jan 16, 2021 at 7:44 PM Christoph Junghans <[email protected]>
wrote:

> On Sat, Jan 16, 2021 at 1:40 AM Pragati Sharma <[email protected]>
> wrote:
> >
> > Dear all,
> >
> > Can the coarse grain potentials using IBI for graphene sheet which is
> periodic along xy direction be performed in votca.
> >
> > I am trying to do it and it's throwing an error saying the "bead is
> bigger than half of the box".
> This check is in there to avoid  non-unique mapping of the position in
> case of periodic boundary conditions.
> You could certainly modify the code to disable it and see what
> happens, but my guess is your setup of the sheet has a very small box
> length in z.
> As that is mainly empty space, just try to increase the box size by a
> factor 10 in z or so.
>
> Above the error message VOTCA prints out two vectors, the first 3
> numbers are the position of the reference point for the pbc
> calculations r0 and the next 3 numbers are the positions of the atoms
> that are too far away from r0. Can you post these numbers?
>
> Christoph
>
> > Any ideas on this.
> >
> > Thanks
> >
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> .
>
>
>
> --
> Christoph Junghans
> Web: http://www.compphys.de
>
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